A YouTube Channel I watch regularly. This is a good example of one of his typical videos. He is German, speaking in English, and it is a bit slow moving at times. I usually speed it up to 1.25 X normal speed. This is an excellent example of his methodical troubleshooting techniques to narrow down the problem – even on a modern type radio. No real special equipment used in this video. A multimeter is the main tool, but a signal generator is used, and a scope briefly, but really not necessary.
Maybe you might find it interesting.
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I have been watching his videos on Balums. He is very thorough but moves slow and sometimes repeats himself to often. His English is poor (as is mine). He pronounces BALUN as BALLOON.